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152 lines
7 KiB
C
152 lines
7 KiB
C
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/*
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** JNetLib
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** Copyright (C) 2000-2001 Nullsoft, Inc.
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** Author: Justin Frankel
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** File: udpconnection.h - JNL UDP connection interface
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** License: see jnetlib.h
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**
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** Usage:
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** 1. Create a JNL_Connection object, optionally specifying a JNL_AsyncDNS
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** object to use (or NULL for none, or WAC_NETWORK_CONNECTION_AUTODNS for auto),
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** and the send and receive buffer sizes.
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** 2. Call connect() to have it connect to a host/port (the hostname will be
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** resolved if possible).
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** 3. call run() with the maximum send/recv amounts, and optionally parameters
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** so you can tell how much has been send/received. You want to do this a lot, while:
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** 4. check get_state() to check the state of the connection. The states are:
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** JNL_Connection::STATE_ERROR
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** - an error has occured on the connection. the connection has closed,
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** and you can no longer write to the socket (there still might be
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** data in the receive buffer - use recv_bytes_available()).
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** JNL_Connection::STATE_NOCONNECTION
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** - no connection has been made yet. call connect() already! :)
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** JNL_Connection::STATE_RESOLVING
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** - the connection is still waiting for a JNL_AsycnDNS to resolve the
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** host.
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** JNL_Connection::STATE_CONNECTING
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** - the asynchronous call to connect() is still running.
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** JNL_Connection::STATE_CONNECTED
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** - the connection has connected, all is well.
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** JNL_Connection::STATE_CLOSING
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** - the connection is closing. This happens after a call to close,
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** without the quick parameter set. This means that the connection
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** will close once the data in the send buffer is sent (data could
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** still be being received when it would be closed). After it is
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** closed, the state will transition to:
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** JNL_Connection::STATE_CLOSED
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** - the connection has closed, generally without error. There still
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** might be data in the receieve buffer, use recv_bytes_available().
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** 5. Use send() and send_string() to send data. You can use
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** send_bytes_in_queue() to see how much has yet to go out, or
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** send_bytes_available() to see how much you can write. If you use send()
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** or send_string() and not enough room is available, both functions will
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** return error ( < 0)
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** 6. Use recv() and recv_line() to get data. If you want to see how much data
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** there is, use recv_bytes_available() and recv_lines_available(). If you
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** call recv() and not enough data is available, recv() will return how much
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** data was actually read. See comments at the function defs.
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**
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** 7. To close, call close(1) for a quick close, or close() for a close that will
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** make the socket close after sending all the data sent.
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**
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** 8. delete ye' ol' object.
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*/
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#ifndef _UDPCONNECTION_H_
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#define _UDPCONNECTION_H_
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#include "asyncdns.h"
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#include "nu/RingBuffer.h"
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#include "jnetlib_defines.h"
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#define JNL_DEFAULT_BUFFER_SIZE 8192
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class JNL_UDPConnection : private Drainer, private Filler
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{
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public:
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typedef enum
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{
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STATE_ERROR = JNL_CONNECTION_STATE_ERROR,
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STATE_NOCONNECTION = JNL_CONNECTION_STATE_NOCONNECTION,
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STATE_RESOLVING = JNL_CONNECTION_STATE_RESOLVING,
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STATE_CONNECTING = JNL_CONNECTION_STATE_CONNECTING,
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STATE_CONNECTED = JNL_CONNECTION_STATE_CONNECTED,
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STATE_CLOSING = JNL_CONNECTION_STATE_CLOSING,
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STATE_CLOSED = JNL_CONNECTION_STATE_CLOSED,
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STATE_RESOLVED = JNL_CONNECTION_STATE_RESOLVED,
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} state;
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JNL_UDPConnection();
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JNL_UDPConnection( unsigned short port, JNL_AsyncDNS *dns, int sendbufsize = JNL_DEFAULT_BUFFER_SIZE, int recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
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~JNL_UDPConnection();
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void open( JNL_AsyncDNS *dns = JNL_AUTODNS, size_t sendbufsize = JNL_DEFAULT_BUFFER_SIZE, size_t recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
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void open( int incoming_socket, JNL_AsyncDNS *dns = JNL_AUTODNS, size_t sendbufsize = JNL_DEFAULT_BUFFER_SIZE, size_t recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
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void setpeer( const char *hostname, int port );
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void setpeer( sockaddr *addr, socklen_t length /* of addr */ );
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void run( size_t max_send_bytes = -1, size_t max_recv_bytes = -1, size_t *bytes_sent = NULL, size_t *bytes_rcvd = NULL );
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int get_state() { return m_state; }
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const char *get_errstr() { return m_errorstr; }
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void close( int quick = 0 );
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void flush_send( void ) { send_buffer.clear(); }
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size_t send_bytes_in_queue( void );
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size_t send_bytes_available( void );
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int send( const void *data, size_t length ); // returns -1 if not enough room
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int send_string( const char *line ); // returns -1 if not enough room
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size_t recv_bytes_available( void );
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size_t recv_bytes( void *data, size_t maxlength ); // returns actual bytes read
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unsigned int recv_int( void );
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int recv_lines_available( void );
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int recv_line( char *line, size_t maxlength ); // returns 0 if the line was terminated with a \r or \n, 1 if not.
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// (i.e. if you specify maxlength=10, and the line is 12 bytes long
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// it will return 1. or if there is no \r or \n and that's all the data
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// the connection has.)
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size_t peek_bytes( void *data, size_t maxlength ); // returns bytes peeked
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int get_interface( sockaddr *sin, socklen_t *sin_length ); // this returns the interface the connection is on
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short get_remote_port( void ) { return m_remote_port; } // this returns the remote port of connection
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void get_last_recv_msg_addr( sockaddr **addr, socklen_t *len ) { *addr = (sockaddr *)&m_last_addr; *len = m_last_addr_len; }
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void set_ttl( uint8_t new_ttl );
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protected:
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uint8_t ttl;
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SOCKET m_socket;
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unsigned short m_remote_port;
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RingBuffer recv_buffer;
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RingBuffer send_buffer;
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sockaddr *address;
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socklen_t address_len;
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sockaddr_storage m_last_addr;
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socklen_t m_last_addr_len;
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addrinfo *saddr;
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char *m_host;
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JNL_AsyncDNS *m_dns;
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int m_dns_owned;
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state m_state;
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const char *m_errorstr;
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private:
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void init(); // constructor helper function
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// functions for RingBuffer
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size_t Read( void *dest, size_t len );
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size_t Write( const void *dest, size_t len );
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};
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#endif // _UDPConnection_H_
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